1000000999008 has 144 divisors (see below), whose sum is σ = 3105561041856. Its totient is φ = 302709707520.

The previous prime is 1000000999007. The next prime is 1000000999021. The reversal of 1000000999008 is 8009990000001.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000999007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2833435 + ... + 3166757.

It is an arithmetic number, because the mean of its divisors is an integer number (21566396124).

Almost surely, 2^{1000000999008} is an apocalyptic number.

1000000999008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1000000999008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552780520928).

1000000999008 is an abundant number, since it is smaller than the sum of its proper divisors (2105560042848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000000999008 is a wasteful number, since it uses less digits than its factorization.

1000000999008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334297 (or 334286 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

Adding to 1000000999008 its reverse (8009990000001), we get a palindrome (9009990999009).

The spelling of 1000000999008 in words is "one trillion, nine hundred ninety-nine thousand, eight".